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Monitoring Pollution

Life-Cycle Analysis Shows Renewables Produce Only 5% of the Emissions of Coal

The 'fuel' used to generate power from the cialis cheap delivery sun or the wind is, of course, emissions free. But we realize that it is necessary to look at more than just the fuel input in evaluating the total impacts of various technologies. Life-cycle analysis (LCA) goes beyond the operational comparison and www.worcestercountybar.org also looks at the impacts of creating the equipment to harness those energies as well as the it's great! viagra 50 mg tablets effects of decomissioning them at their end of how much cialis life.

Research by the National Renewable Energy Laboratory (NREL) has looked at a wide range of studies carried out to asess the greenhouse gas effects related to we use it buy levitra 50 mg different forms of energy. THe NREL meta-study sought to equalize and balance the different studies carried out by different researchers in such a fashion that they could be compared with each other.

The conclusions show that "greenhouse-gas emissions from wind power and solar photovoltaics are about 5% of those from coal and that nuclear energy emissions are on par with those from renewable energy."

Renewables such as solar and wind produce far fewer greenhouse-gas emissions than coal, oil or natural gas while in operation. But the meta-analysis looked even deeper, at emissions estimates starting with the manufacture of solar panels, wind turbines, coal plants or natural-gas lines, all the way to the cheap viagra lowest prices index emissions estimates for decommissioning the sites.

While it may seem intuitively obvious, the ability to cross-compare between different studies has not been there previously, and this will allow for better comparison between different techologies, as well as giving a more even picture of the benefits of renewable energy.

via: NA Windpower

 

Envisat Environmental Monitoring Satellite Goes Silent


The Envisat, the largest environmental monitoring satellite in history, has gone silent after a decade of operation. The satellite was launched in March 2002 by the European Space Agency and has been sending information on the planet's oceans, ice, land and atmosphere since then. The ESA says it failed to make contact on April 8 as it passed over a Swedish ground station.

Envisat is united pharmacy cialis canada equipped with 10 different instruments for collecting environmental data that has been used in 4,000 science projects by 70 countries. The data has been crucial in studies on cialis overnight climate change.

The ESA hasn't given up hope for the satellite. It has brought together engineers, flight dynamics scientists and http://eatingdisorderrecovery.com/levitra-online-store mission operators to work on re-establishing contact. But even if that is not possible, climate change science won't suffer for long; the ESA already had plans to launch seven Sentinel satellites in 2013 to replace the Envisat.

via Phys.org

Image via viagra on sale ESA

 

NASA Releases Updated Video Showing Warming Temperatures Since 1880


Last year was the ninth warmest year on record (since 1880). Global average surface temperatures has continually risen since 1950, when the average global temperature was 0.92 degrees F (0.51 C) cooler than in 2011.

An updated video compiled by NASA's Goddard Institute for Space Studies illustrates this warming trend in colorful detail. Red in the dosage levitra video represents temperatures higher than the average during the 1950 - 1981 baseline period while blue represents temperatures lower than that average.

While 2011 was the ninth warmest year, 2010 was the warmest year on record. The difference in average temperature between 2010 and 2011 was 0.22 degrees F (0.12 C). Temperatures may fluctuate slightly from year to levitra buying year, but, as this analysis shows, the overall trend of cialis online pharmacy no prescription rapid warming continues.

via NASA
 

Study: Decrease in Sun's Output Won't Curb Global Warming


A new study done by the University of Reading and the Met Office looked at the likely changes in solar activity over the next 90 years and whether a decrease would offset global warming by any significant measure.  The answer:  no.

The study found that the sun's output is likely to decrease until 2100, but that decrease will only lead to a global temperature reduction of 0.08 °C.  Compared to the forecasted warming of at least 2.5 °C over the same period from greenhouse gases, a solar activity decline doesn't get us very far.

The study found that even if the sun's output fell to it's lowest known levels that occurred between 1645 and 1715, global temperatures would still only be reduced by 0.13 °C.

While the look here viagra price in canada study's authors concede that their model doesn't fully capture all of the uncertainties in the climate system and solar output, the results do certainly let us know that a decline in solar activity is no match for greenhouse gas emissions.

via Physorg

 

Hailstorms and Tornadoes Thrive on Car Exhaust


If you wanted something else to blame on the internal combustion engine, you can now add tornadoes and hailstorms to the list.  Scientists have found that both weather events are more likely to occur during the week than the weekend due to best price on cialis the higher levels of pollution in the air from our workday commutes.

The study, published in the Journal of Geophysical Research - Atmospheres, looked at summer storm patterns in the eastern U.S. from 1995 to 2009 and found that hailstorms were occurring at a rate of only best offers buy prescription levitrabuy levitra in the uk about 20 percent above average midweek and about 20 percent below average on Saturday and new canadian meds Sunday. The team then looked at EPA records of summertime air pollution in the eastern U.S. and found that it peaks midweek.

The reason is that water particles cling to pollutants in the air, floating up higher in the atmosphere where it's colder and creating more hail.  Pollutants also create tornado-friendly conditions by making the air warmer.

The western U.S. doesn't experience this same phenomenon since the air is dryer and cloud masses are too high and cold for the air pollution to interfere with.

via National Geographic
 
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